Today, plain text messages to BTInternet users with no URL links or anything, are getting rejected. Even to my own parents!
The account/domain/ISP I am sending from is NOT on any RBL and also has a valid SPF, DKIM and DMARC policy and settings.
Final-Recipient: rfc822; XXXXX@btinternet.com Action: failed Status: 5.0.0 Remote-MTA: dns; mx.bt.lon5.cpcloud.co.uk. (184.108.40.206, the server for the domain btinternet.com.) Diagnostic-Code: smtp; 554 Message rejected, policy (220.127.116.11) – Your message looks like SPAM or has been reported as SPAM please read www.bt.com/bulksender Last-Attempt-Date: Mon, 20 Feb 2017 06:34:33 -0800 (PST)